2,6-TOLUENE-DIISOCYANATE (TDI)

Chemical Identification
Chemical Identification
CAS # 91-08-7
Formula
 

C₉H₆N₂O₂

Synonyms
 

2,6-toluene diisocyanate; 2,6-TDI; 2,6-diisocyanato-1-methylbenzene; 2,6-diisocyanatotoluene

Physical Properties
Physical Properties
Physical description Colorless to pale-yellow solid or liquid with a pungent odor.
Boiling point 264-271°F Molecular weight 174.2
Freezing point/melting point 68-72°F Vapor pressure 0.5 mmHg at 77°F for 80% 2,4:20%; 2,6 TDI mixture
Flash point Vapor density 6
Specific gravity 1.2244 at 68°F Ionization potential
Lower explosive limit (LEL) 0.9% Upper explosive limit (UEL) 9.5%
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) T177
Sampling group
Sampler/Sampling media Isocyanate Sampling Filter Kit - GFF (37 mm, open-faced) coated with 1 mg 1-(2-pyridyl)piperazine [SLTC103]
Sampling time*
 

15 min

Sampling volume (TWA)*
 

15 L

Sampling flow rate (TWA)*
 

1 L/min

Sampling volume (STEL/Peak/C)*
 

 

Sampling flow rate (STEL/Peak/C)*
 

 

Analytical method instruments HPLC
Method reference OSHA 5002 (fully validated)
Notes
 

Refrigerate coated filters until used. Sample open-faced!!

Special requirements
 

 

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
 

 

Bulk Method
Bulk Method
 

 

On-Site Screening Techniques
On-Site Screening Techniques
Device Detector tube
Model/Type Dräger - Toluene diisocyanate 0.02/a, 6724501
Sampling information
(see manufacturer instructions)
25 strokes, approx 0.02-0.2 ppm range, uncertainty 30%
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 

 

REL-TWA
 

 

TLV-TWA
 

0.001 ppm (inhalable fraction and vapor) [2015]

PEL-TWA
 

 

PEL-STEL
 

 

REL-STEL
 

 

TLV-STEL
 

0.005 ppm (inhalable fraction and vapor) [2015]

PEL-STEL
 

 

PEL-C
 

 

REL-C
 

 

TLV-C
 

 

PEL-C
 

 

Skin notation
 

NA

Skin notation
 

NA

Skin notation
 

Y

Skin notation
 

NA

Notes:
 

See 2,4-TOLUENE-DIISOCYANATE

Notes:
 

Not established

Notes:
 

dermal sensitizer (DSEN), respiratory sensitizer (RSEN)

Notes:
 

Not established

Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: IARC-2B, NIOSH-Ca, NTP-R Notes:
 

 

AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 

0.01 ppm/0.15 ppm/0.6 ppm

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Toluene-2,6-diisocyanate

NIOSH: Pocket Guide to Chemical Hazards - Not listed

Literature References

 

Last Updated Date : 04/19/2021